Teakettle and like domestic boiler



Oct. 13, 1931. F. D. AUSTIN TEAKET'I'LE AND LIKE DOMESTIC BOILER FiledMay 21. 1929 gnuvntot U 5 T] N FREDERIEKDA Z13 Cutonwq wall of the body1.

Patented Oct. 13, 1931 UNITED STA E ATENT OFFICE EREDERiQK DAVIDAUSTIN,or ro 'r cHEs'rE NEW YORK, AssIGNoR or ONE-HALF 'ro DAVIDJ. KELLY, JR,or roR'r CHESTER, NEW YORK TEAKETrLE Ann LIKE 'noMRs'r'Ic BoiLnRApplication filed ma 21, 19 29. Serial No. 364,843.

This invention relates to improvements in portable domesticwaterheaters, and more particularly to the type commonly designatedtea-kettles. v V

The primary object inviewis maximum efficiency in heat transference, anda further object is the raising of the temperature of a relatively smallquantity of water quickly to a high degree with a minimum expenditure offuel. i u I With these and furtherobjects in view as will inparthereinafter become apparent and in part be stated, the-inventioncomprises certain novel constructions, combinations, and arrangements ofparts as subsequently specified and claimed. i

In the accompanying drawings,

Figure lis a sectional elevation of ateakettle involving the features ofthe present invention.

, Figure 2 is an inverted plan'view thereof.

Figure 8 is a diagrammatic illustration on a reduced scale of the samestructure at tached to deliversteam to a domestic cooker.

Referring to the drawings by numerals, 1 indicates the body having theconventional exterior contour of an ordinary tea-kettle and providedwith the usual spout 2 and removable cover 3. An appropriate bail orother handle 4 is customarily connected as a convenient means ofmanually transporting or otherwise handling the body 1 and its connectedparts. The body 1 is also provided with the usual bottom 5, but thebottom 5 differs from the conventionaltea-kettle bottom by being formedup into a dome 6' within the body 1. Dome 6 leaves a water leg or space7 between itself and the surrounding Dome 6 may be of any desired crosssectional area and of any of various peripheral contours, but it isdesirable that the water leg or space 7 shall be comparatively thin withrespect to the diameter of the body 1. The dome 6 is made up of anupstanding wall and a top or closure 8, said wall and top beingpreferably integral with each other and also integral with the bottom 5.The upper surface of the top 8 at its highest point is substantiallybelow the highest polnt of exit through the spout 2, so

that the water level maybe above the cover plate 8 and still provide forthe exit of vapor or steam through the spout 2.

WVithin the dome 6 are arranged water cir-.

oulat'ing coils 9, each consisting of a pipe communicating at 10 with alower portion of the Water leg 7 and at 11 with an upper portion of theWater Within the body 1 preferably through the cover plate 8. The pipeof each coil 9 is extended Within the dome 6 practically the full widthacross the dome, and then folded back upon itself in a series offlights'each slightly upwardly inclined from starting point 10, so thata continuous upward path is provided for water travelling fromthe'pointlO to the point 11. The alternat'e coils9 at their lower endsare preferably connected at one side of the .dome 6 and the otheralternate coils are connected at the opposite side.

The thus constructed tea-kettle or similar portable domestic waterheater is adapted for use exactly as any ordinary tea-kettle,

but the eliiciency is so much greater than the average "tea-kettle thatthe structureis well adapted for use as a vapor or steam generator, fordomestic purposes. 'When the tea kettle is supplied with water andplaced over a source of heat, such as a gas burner, the heat acts on thebottom 5 and on the coils 9 and also on the exposed surfaces of the dome6 and cover plate 8. Fluting or corrugation of plate 8 may be providedfor increasing the surface exposed directly to the heat action, but moresurface exposure to flames or other sources of heat has not been foundby me to alone effect satisfactory results or'to distinctivelycharacterize a structure as superio'r to those previously known;However, the'functioning of the coils 9 is such as to producedistinctive and superior results. The heat influencing'the water withinthe lower lapso'r flights of the coils 9causes the water to ascend inthecoils and discharge at the places. 1.1; The cooler Water follows inthrough the intake ends 10, and, being heated. rises and thuscirculation continues.

'The' resultingfaction is such that I have been able to boil water in atime unprecedentedly brief.- I have raised water from a temperature ofto a point above 212 F., when treating but a quart of water, in thirtyseconds, and, when treating a gallon of water, I have brought the wholegallon to a boiling point in two minutes, and, under favorableconditions, in a slightly less time. This has been accomplished by me bythe use of the structure as illustrated and above described when appliedon an ordinary gas burner of the type commonly found in the kitchen gasrange.

The several coils 9 have their ends connected to the respectivepenetrated walls by being spun or otherwise anchored thereto, preferablysubstantially in the same manner as the connection of the spout of thekettle to the body thereof. Of course, other means of connection, suchas brazing or even screwthreading, may be employed when and as desired.

Because of the unusual high degree of efficiency in heat transferencemanifested by the structure described, I have found the structureespecially well adapted for use as a source of vapor or steam forlimited uses, such as the supply of steam to a clothes pressing machineor for steam cookers. As a means of demonstrating this utility of thepresent invention, the body 1 is preferably provided with a return pipeconnection 12 capped at 13 when the tea-kettle is. to be used in theordinary fashion and not as a source of steam. The spout 2 is preferablythreaded at 14C, and when the device is intended to 1 sun 31 steam foran ur ose a riser ie 15 is connected to the spout 2 by means of thethreads 141-, while the pipe 12 is connected to a return pipe 16. Thepipe 15 may be caused to communicate with a steam or pressure cooker 17,or other instrument, for utilizing steam or vapor, and, of course, thereturn pipe 16 is connected to receive the drain from such instrument.

What is claimed is 1. A portable water heater comprising an enclosingbody, a dome Within the body opening through the bottom thereof, and aplurality of water circulating coils Within the dome, each communicatingat one end at a lower point and at the other end at an upper point ofthe interior of the body, said coils being laterally spaced with respectto each other and each comprising superimposed and alined flights, allparts of each coil with its connections being entirely free from andspaced laterally of the adjacent coils.

2. A portable water heater comprising an enclosing body, a dome withinthe body opening through the bottom thereof, and a plurality of watercirculating coils within the dome, each communicating at one end at alower point through the dome and. at the other end through the top ofthe dome, said coils being laterally spaced with respect to each otherand each comprising superimposed fiights, the coils extendingsubstantially across the dome and each coil having its ends at the sameside of the dome, the ends of adjacent coils being at alternatelyopposite sides of the dome.

3.. A portable water heater comprising an enclosing body, a dome withinthe body opening through the bottom thereof and terminating short of thetop of the body, the dome having a corrugated cover, and a plurality ofwater circulating coils arranged within the dome and spaced apartlaterally, each communicating at one end at a lower point throught thedome and at the other end through the corrugated cover of the dome, andeach comprising superimposed and alined flights, and each coil extendingsubstantially across the dome at each flight and having its endssubstantially at the same side of the dome.

4. A portable water heater comprising an enclosing body, a dome withinthe body opening through the bottom therof, and a plurality of laterallyspaced Water-circulating coils within the dome, each communicating atone end at a lower point through the dome and at the other end throughan upper portion of the dome, both ends of each coil being arrangedsubstantially at the same side of the dome and at the opposite side fromthe laterally adjacent coils, all. parts of each coil with itsconnections being entirely free from and spaced laterally of theadjacent coils.

In testimony whereof I affix my signature.

FREDERICK DAVID AUSTIN.

